Overheating
Overview
In the drive to tackle climate change a number of virtuous initiatives combine to increase the risk of overheating. As policy directs new development towards urban centers, the risks associated with a gradually warming climate are exacerbated by the added influence of urban heat islanding. It is against this backdrop that trends towards smaller unit size, enlarged glazing, and radically improved thermal insulation conspire to create new and pressing overheating risks.
GV8 assesses overheating risk in accordance with the methods detailed in CIBSE TM52 and TM59. Using fully developed dynamic thermal simulation techniques GV8 can predict the risk of overheating under both historic and future climate scenarios. When identified at an early stage in the design process, it is often possible to identify simple design amendments which sidestep the need for expensive retrofit measures like mechanical cooling or external shading.
Key Tests
Overheating risk in non-domestic properties is assessed with respect to the adaptive comfort criteria detailed in CIBSE TM52; these criteria include Hours of exceedance, Daily Weighted Exceedance as well as Upper Limit Temperatures.
Overheating risk in domestic accommodation is assessed with respect to the Hours of Exceedance with specific fixed thermal thresholds recommended for bedrooms.
- The assessment of skylight impact to neighbouring windows; tested with respect to a measure called Vertical Sky Component (VSC).
- The assessment of sunlight impact to neighbouring windows; tested with respect to a measure called Annual Probable Sunlight Hours (ASPH).
- The assessment of sunlight impact to neighbouring outdoor recreation spaces; tested with respect to a measure called Sun On Ground (SOG).
Additional Services
Let's Talk
Book a Site Appraisal
Are you at the early stage of a sites development? GV8 has the expertise and tools needed to quickly identify the design outlines that your site could support. Please get in touch at any stage to book a free preliminary, no strings attached, consultation.
Book a Presentation
With over 10years of experience working in this field of practice GV8 has a clear understanding of daylight standards and the way they interface with planning policy. Please get in touch if you would like GV8 to present to the members of your organisation.
